"I do not like that."
Translation:Cha toil leam sin.
Gaelic doesn't like going from words that end in a vowel into a word that starts with a vowel and will try to break the contact.
you only add an n to chan when the first sound in the next word is a vowel. For example chan eil, but also chan fhaca (the fh is silent). Everything else uses just cha. Cha toil, cha tug, cha do leugh, etc.
Cha toil leam sin is I don't like that. Cha toil leam idir is an incomplete sentence saying I don't like at all; it would need something else to show what you don't like, eg Cha toil leam e idir (I don't like it at all) or Cha toil leam sin idir (I don't like that at all)